We study an Ising chain undergoing a quantum phase transition in a quantum magnetic field. Such a field can be emulated by coupling the chain to a central spin initially in a superposition state. We show that--by adiabatically driving such a system--one can prepare a quantum superposition of any two ground states of the Ising chain. In particular, one can end up with the Ising chain in a superp...

The phase diagram of the XXZ chain under the influence of homogeneous and staggered magnetic fields is calculated. The model has a rich phase structure with three types of phases. A fully ferromagnetic phase, an antiferromagnetic phase and a massless phase with partial ferromagnetic and antiferromagnetic order. This massless phase has its critical fluctuations governed by a conformal field theo...

Many-body localization (MBL) is an active area of research studying the effects of interactions added to an Anderson insulator [1–4]. One characteristic feature (among others) of MBL lies in the entanglement dynamics [5]: Starting from a product state, the entanglement entropy grows logarithmically with time. This is in contrast to the case of an Anderson insulator, in which the entanglement en...

This paper presents a research framework for studying supply chain excellence, emphasizing two distinct paths of knowledge acquisition, that is qualitative inquiry through interviews with senior supply chain executives in Taiwan and quantitative inquiry through data collection from companies that operate in Taiwan. Four factors are considered as the antecedents of supply chain excellence, such ...

The discrete Schrödinger equation with a quasiperiodic dichotomous potential specified by the Fibonacci sequence is known to have a singular continuous eigenvalue spectrum with all states being critically localized. This equation can be transformed into a quasiperiodic skew product dynamical system. In this iterative mapping which is entirely equivalent to the Schrödinger problem, critically lo...